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Progress of data-driven remotely sensed retrieval methods and products on land surface evapotranspiration

  • role： First author第一作者
  • Affiliation：

    Key Laboratory of Agricultural Remote Sensing, Ministry of Agriculture and Rural Affairs, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China

  • Email：liumeng01@caas.cn
  • Introduction：刘萌，1990年生，女，助理研究员，研究方向为地表蒸散发遥感反演。E-mail： liumeng01@caas.cn
LIU Meng1,  
  • Affiliation：

    State Key Laboratory of Resources and Environment Information System, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China

    University of Chinese Academy of Sciences, Beijing 100049, China

TANG Ronglin23,  
  • role： Corresponding author通信作者
  • Affiliation：

    Key Laboratory of Agricultural Remote Sensing, Ministry of Agriculture and Rural Affairs, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China

  • Email：lizhaoliang@caas.cn
  • Introduction：李召良，1964年生，男，研究员，研究方向为热红外遥感。E-mail：lizhaoliang@caas.cn
LI Zhaoliang1*,  
  • Affiliation：

    Key Laboratory of Agricultural Remote Sensing, Ministry of Agriculture and Rural Affairs, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China

GAO Maofang1,  
  • Affiliation：

    State Key Laboratory of Remote Sensing Science, Faculty of Geographical Science, Beijing Normal University, Beijing 100875, China

YAO Yunjun4

Resümee

Evapotranspiration (ET) links the water cycle and energy exchange in hydrosphere, atmosphere, and biosphere. From a global perspective, ET accounts for approximately 60% of the total land precipitation, and the latent heat accompanying ET accounts for approximately 80% of the total surface net radiation energy. With the development of eddy covariance technology, global long-term and continuous observed meteorological and flux data are publicly available online. In last decade, data-driven remotely sensed ET retrieval methods have achieved rapid development. In terms of data-driven remotely sensed retrieval ET, this paper reviews and summarizes the existing researches on empirical regression methods, machine learning methods, data fusion methods and their corresponding products, then points out the existing problems and deficiencies on the driven data, retrieval methods, and available products. To be specific, these problems include: (1) There are few data-driven remotely sensed ET products with high precision and high spatiotemporal resolution; (2) The spatial scale mismatch between satellite pixel and in situ measurements makes the data-driven remotely sensed ET estimates challenging; (3) The lack of physical mechanisms for the data-driven remotely sensed retrieval ET methods and the insufficient regional representativeness for observed data from hundreds of sites, the spatial application of the ET model is limited; (4) Several important driving factors of ET, such as land surface temperature and soil moisture, were not sufficiently considered in previous studies; (5) The energy balance at flux measurement sites that based on eddy covariance method is not closed with about 0.8 unclosed rate globally, whether carry out energy balance closure correction before modeling is still a controversy; (6) The partitioning between soil evaporation and vegetation transpiration is of great significance, but the data-driven remotely sensed models that could estimate soil evaporation and vegetation transpiration respectively were not well studied. In the era of big data, as a double-edged sword, data-driven approaches are not only opportunities but also challenges, and several suggestions for future studies are proposed at the end. To begin with, the data-driven remotely sensed retrieval ET methods with high spatiotemporal resolution should be proposed. The observed source area should be introduced into the model constructing to solve the mismatch between satellite pixel and the measurements so as to improve the estimated ET accuracy. In addition, some important information, such as land surface temperature and soil moisture, which has an important effect on ET process should be taken into consideration effectively. Although vegetation index could indicate the long-term change of ET, land surface temperature could better indicate its short-term change. At the same time, soil moisture deficit would produce water stress on ET. Effective consideration of land surface temperature and soil moisture may improve the estimation accuracy of ET. Last but not least, it's important to emphasize that data-driven empirical approaches will not replace process-driven physical models, but strongly supplement and enrich the ET estimation methods. The combination of process-driven physical models and data-driven empirical approaches should be strengthened in order to obtain more reliable and accurate ET estimation by remote sensing. One suggestion is that, in future studies, data-driven approaches should be used to estimate important variables that closely related to ET but unavailable directly from remote sensing satellite at present, then physical models could be used for ET estimation. So as to the two kinds of models can fully play their roles respectively, jointly promote the research level of remotely sensed retrieval ET.

Schlüsselwort

land surface evapotranspiration;data-driven;land surface temperature;empirical method;machine learning;data fusion;remote sensing products

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